According to the Radio Times, a portion of the fifth season of Downton Abbey will be filmed at Alnwick Castle, best known as the stand-in for the Hogwarts School in the first two 'Harry Potter' films.

While Highclere Castle and its local village is typically where the majority of filming is done for the historical drama series, the official website for Alnwick has posted a notice for future visitors which reads:

"Please note that various areas of Alnwick Castle will be closed or have limited access on 28th July - 8th August (inclusive), due to the filming of a major ITV period drama. ... Please note that some of the State Rooms may be dressed for filming while open to the public on those days."

Though filming on Season 5 is almost complete, speculation is that the traditional end-of-season Christmas episode may be set in the new location. Looks like we'll have to wait until Sunday, January 4, 2015, when the series returns to PBS, to find out!